I could interrupt you could interrupt he could interrupt we could interrupt you could interrupt they could interrupt
V-ing form
I could be interrupting you could be interrupting he could be interrupting we could be interrupting you could be interrupting they could be interrupting
Perfect
I could have interrupted you could have interrupted he could have interrupted we could have interrupted you could have interrupted they could have interrupted
V-ing perfect
I could have been interrupting you could have been interrupting he could have been interrupting we could have been interrupting you could have been interrupting they could have been interrupting
Negation
Simple form
I couldn't interrupt you couldn't interrupt he couldn't interrupt we couldn't interrupt you couldn't interrupt they couldn't interrupt
V-ing form
I couldn't be interrupting you couldn't be interrupting he couldn't be interrupting we couldn't be interrupting you couldn't be interrupting they couldn't be interrupting
Perfect
I couldn't have interrupted you couldn't have interrupted he couldn't have interrupted we couldn't have interrupted you couldn't have interrupted they couldn't have interrupted
V-ing perfect
I couldn't have been interrupting you couldn't have been interrupting he couldn't have been interrupting we couldn't have been interrupting you couldn't have been interrupting they couldn't have been interrupting
Interrogative form
Simple form
could I interrupt? could you interrupt? could he interrupt? could we interrupt? could you interrupt? could they interrupt?
V-ing form
could I be interrupting? could you be interrupting? could he be interrupting? could we be interrupting? could you be interrupting? could they be interrupting?
Perfect
could I have interrupted? could you have interrupted? could he have interrupted? could we have interrupted? could you have interrupted? could they have interrupted?
V-ing perfect
could I have been interrupting? could you have been interrupting? could he have been interrupting? could we have been interrupting? could you have been interrupting? could they have been interrupting?
Interro-negative form
Simple form
couldn't I interrupt? couldn't you interrupt? couldn't he interrupt? couldn't we interrupt? couldn't you interrupt? couldn't they interrupt?
V-ing form
couldn't I be interrupting? couldn't you be interrupting? couldn't he be interrupting? couldn't we be interrupting? couldn't you be interrupting? couldn't they be interrupting?
Perfect
couldn't I have interrupted? couldn't you have interrupted? couldn't he have interrupted? couldn't we have interrupted? couldn't you have interrupted? couldn't they have interrupted?
V-ing perfect
couldn't I have been interrupting? couldn't you have been interrupting? couldn't he have been interrupting? couldn't we have been interrupting? couldn't you have been interrupting? couldn't they have been interrupting?